.spinner {
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 50%;
  box-sizing: border-box;
  border-top: 4px solid #fff;
  border-left: 4px solid #fff;
  border-right: 4px solid #ff00;
  animation: spinner 0.7s infinite linear;
}

@keyframes spinner {
  to {
    transform: rotate(360deg);
  }
}
